spark costing 源码
spark costing 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/costing.scala
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.sql.execution.adaptive
import org.apache.spark.SparkConf
import org.apache.spark.annotation.Unstable
import org.apache.spark.internal.Logging
import org.apache.spark.sql.execution.SparkPlan
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.util.Utils
/**
* An interface to represent the cost of a plan.
*
* @note This class is subject to be changed and/or moved in the near future.
*/
@Unstable
trait Cost extends Ordered[Cost]
/**
* An interface to evaluate the cost of a physical plan.
*
* @note This class is subject to be changed and/or moved in the near future.
*/
@Unstable
trait CostEvaluator {
def evaluateCost(plan: SparkPlan): Cost
}
object CostEvaluator extends Logging {
/**
* Instantiates a [[CostEvaluator]] using the given className.
*/
def instantiate(className: String, conf: SparkConf): CostEvaluator = {
logDebug(s"Creating CostEvaluator $className")
val evaluators = Utils.loadExtensions(classOf[CostEvaluator], Seq(className), conf)
require(evaluators.nonEmpty, "A valid AQE cost evaluator must be specified by config " +
s"${SQLConf.ADAPTIVE_CUSTOM_COST_EVALUATOR_CLASS.key}, but $className resulted in zero " +
"valid evaluator.")
evaluators.head
}
}
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